gitea: default repo setting; editor: asset picker with thumbnail grid

Gitea plugin: default_repo field per account (stored in DB, pre-fills
create issue form but stays editable). Editor toolbar: asset picker
flyout with 4-column thumbnail grid and live search filter. Clicking
a tile inserts the matching markdown.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/gitea/backend.php

@@ -27,10 +27,16 @@ require_once __DIR__ . '/GiteaClient.php';
             name TEXT NOT NULL,
             base_url TEXT NOT NULL,
             token TEXT NOT NULL,
+            default_repo TEXT DEFAULT NULL,
             position INTEGER NOT NULL DEFAULT 0,
             created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
         )
     ");
+    // Migration: add default_repo column if missing
+    $cols = $db->query("PRAGMA table_info(gitea_accounts)")->fetchAll(PDO::FETCH_COLUMN, 1);
+    if (!in_array('default_repo', $cols)) {
+        $db->exec("ALTER TABLE gitea_accounts ADD COLUMN default_repo TEXT DEFAULT NULL");
+    }
 })();
 
 // ── Encryption helpers (mirrors email plugin / CalDavSync) ────────
@@ -85,7 +91,7 @@ PluginManager::instance()->onApiRoute(function (string $route, string $method) {
 
     if ($route === '/api/gitea/accounts' && $method === 'GET') {
         $db = Database::connect();
-        $rows = $db->query('SELECT id, name, base_url, position, created_at FROM gitea_accounts ORDER BY position ASC, id ASC')->fetchAll();
+        $rows = $db->query('SELECT id, name, base_url, default_repo, position, created_at FROM gitea_accounts ORDER BY position ASC, id ASC')->fetchAll();
         giteaJson($rows);
     }
 
@@ -132,6 +138,10 @@ PluginManager::instance()->onApiRoute(function (string $route, string $method) {
         if (!empty($input['token'])) {
             $fields[] = 'token = :token'; $params['token'] = giteaEncrypt($input['token']);
         }
+        if (array_key_exists('default_repo', $input)) {
+            $val = trim((string)($input['default_repo'] ?? ''));
+            $fields[] = 'default_repo = :default_repo'; $params['default_repo'] = $val ?: null;
+        }
         if (!$fields) giteaJson(['ok' => true]);
         $db = Database::connect();
         $db->prepare('UPDATE gitea_accounts SET ' . implode(', ', $fields) . ' WHERE id = :id')->execute($params);